docstr: Shuts down workers and releases resources.
docstr_tok: ["Shuts","down","workers","and","releases","resources","."]
code: def shutdown(self):
      """
      Shuts down workers and releases resources.
      """
      for worker in self.remote_workers:
          worker.shutdown.remote()
          worker.__ray_terminate__.remote()
  
imports: import itertools
  import logging
  import pickle
  import numpy
  import ray
  from zoo.common.utils import enable_multi_fs_load, enable_multi_fs_save
  from zoo.orca.data.ray_xshards import RayXShards
  from zoo.orca.learn.dl_cluster import RayDLCluster
  from zoo.orca.learn.tf2.tf_runner import TFRunner
  from zoo.orca.learn.ray_estimator import Estimator
  from zoo.orca.learn.utils import maybe_dataframe_to_xshards, dataframe_to_xshards, convert_predict_xshards_to_dataframe, update_predict_xshards, process_xshards_of_pandas_dataframe
  from zoo.orca.data.utils import process_spark_xshards
  from zoo.ray import RayContext
label_desc: Use image node_id 9 for calling the TensorFlow2Estimator obj's underlying member method code with example usage: obj.shutdown() without return types